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Comparison of intraoperative subtraction pachymetry and postoperative anterior segment ocular coherence tomography with 150 khz and 60 khz femtosecond laser

Session Details

Session Title: Keratoconus and ectasia

Session Date/Time: Tuesday 08/10/2013 | 16:30-18:00

Paper Time: 16:52

Venue: Elicium 2 (First Floor)

First Author: : L.He USA

Co Author(s): :    E. Manche              

Abstract Details


To prospectively compare intraoperative subtraction pachymetry flap thickness measurements and postoperative anterior segment optical coherence tomography (AS­OCT) flap thickness measurements in eyes undergoing laser in situ keratomileusis flap creation with a 150 kHz femtosecond laser and a 60 kHz femtosecond laser.


Byers Eye Institute at Stanford


Each patient received wavefront­guided LASIK using the AMO Intralase iFS 150 femtosecond laser in one eye and the AMO Intralase FS 60 femtosecond laser in their fellow eye. Both lasers used a programmed flap thickness of 105 um with a 9.0 mm superior hinge. Flap thickness was assessed with an ultrasound pachymeter intraoperatively and anterior segment ocular coherence tomography (AS­OCT) postoperatively at 1 month.


Fifty­two eyes of 26 subjects were available for analysis. Mean intraoperative flap thickness by ultrasound pachymetry was 98.0 ±13.5 ?m (range: 68 to 149 ?m) and 94.0 ±14.4 ?m (range: 59 to 126 ?m) in the iFS 150 and the FS 60 femtosecond laser treated eyes respectfully. Mean central flap thickness by anterior segment OCT was 104.0 ± 5.28 ?m (range: 82 to 111 ?m) and 105.6 ± 4.89 ?m (range: 99 to 115 ?m) postoperatively at 1 month in the iFS 150 and the FS 60 femtosecond laser treated eyes respectfully.


There were no statistically significant differences in achieved flap thickness between the 150 kHz and 60 kHz femtosecond lasers when measuring intraoperative subtraction pachymetry or postoperative anterior segment OCT. Postoperative AS­OCT measurements varied less than intraoperative subtraction pachymetry measurements.

Financial Interest:


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